Direct Vent; Venting - Raypak X94 Installation & Operating Instructions Manual

VENTING

CAUTION: Proper installation of flue venting is
critical for the safe and efficient operation of the
heater.
General
Appliance Categories
Heaters are divided into four categories based on the
pressure produced in the exhaust and the likelihood of
condensate production in the vent.
Category I – A heater which operates with a non-pos-
itive vent static pressure and with a vent gas tempera-
ture that avoids excessive condensate production in
the vent.
Category II – A heater which operates with a non-pos-
itive vent static pressure and with a vent gas tempera-
ture that may cause excessive condensate production
in the vent.
Combustion
Air Supply
From Inside Building
From Outside Building
(Direct Vent or
Ducted Combustion Air)
Exhaust
Configuration
Category
Vertical
Venting
Horizontal
Through-the-Wall
Venting
Vertical Venting
with Ducted
Combustion Air
Vertical

Direct Vent

Horizontal
Direct Vent
Table 4: Venting Category Requirements
17
Category III – A heater which operates with a positive
vent pressure and with a vent gas temperature that
avoids excessive condensate production in the vent.
Category IV – A heater which operates with a positive
vent pressure and with a vent gas temperature that
may cause excessive condensate production in the
vent.
See the table below for appliance category require-
ments.
NOTE: For additional information on appliance
categorization, see appropriate ANSI Z21 Standard
and the NFGC (U.S.), or B149 (Canada), or
applicable provisions of local building codes.
WARNING: Contact the manufacturer of the vent
material if there is any question about the appliance
categorization and suitability of a vent material for
application on a Category III or IV vent system.
Using improper venting materials can result in
personal injury, death or property damage.
Heater Certified Materials
Venting (Must be UL 1738
or ULC S636)
IV
IV
Metallic Vent
(such as AL29-4C),
Duravent PolyPro,
IV
ASTM D1785 Sch 40
PVC, ASTM F441
Sch 40 CPVC
IV
IV
Combustion Air
Inlet Materials
Galvanized Steel
PVC
ABS
CPVC